Like I said, we do playback based on pitch, not position. Is there a problem you're trying to solve? Is there something wrong with how absolute position playback is working?
On Sat, 2013-07-06 at 19:08 +0200, petah wrote: > On Sat, 06 Jul 2013 11:14:13 -0400 > Owen Williams <owilliams-opwvymzfgylytjvyw6y...@public.gmane.org> wrote: > > I'm confused, what are you trying to do? For vinylcontrol absolute > > mode, we mostly use the pitch value and then nudge the speed up or down > > if it drifts too far from the reported timecode position.For CDs, if > > it's more than .1 seconds off then we just seek to that position. I > > don't really see the point of having 22 bit resolution. > > 22-bits is the maximum resolution the CDJ timecode returns for a > single-track CD. On a 4-track CD a timestamp is 2.38ms or a worst-case > latency of ~5ms. OTOH nudging +/- 0.1 second is 100ms or 20x worse. > > Dropping seek commands based on acceptable drift is fine on > full-resolution incoming timecode at the receiver end, but doing > roundtrips and diffs to reach an absolute position makes no sense if > the timecode is absolute to begin with. I'd turn the comment around: I > don't see the point of truncating bits in the protocol to later try > recovering them by chasing the needle :) > > -- p > > > On Sat, 2013-07-06 at 11:56 +0200, petah wrote: > > > What message should be used to set the absolute position of the virtual > > > needle of a loaded track given an absolute time position, f.ex. 2mins > > > 34secs 567millisecs? > > > > > > I went through all the relevant docs (I think), incl. controls and HID > > > mappings and didn't find a clear solution. > > > > > > I need to match an analog CDJ's time display with Mixxx's via a timecode > > > CD using absolute timestamps (4 tracks x 15min), i.e. time scale between > > > CDJ/Mixxx needs to be 1:1 and clamp, not stretch. > > > > > > F.ex. "vinylcontrol_mode" is a 3-way switch, one being absolute, but I > > > don't see the "set absolute time" message. "playPosition" is scaled over > > > the length of the track loaded in mixxx, which won't match a timecode > > > CD's track. "scratch2" affects the "absolute speed", hence the relative > > > position. > > > > > > The absolute time position needs to have at least 22-bit resolution so a > > > gentle pitch bend can go through the engine via that cursor position and > > > behave as expected, i.e. if any scaling/compression is applied along the > > > way it wouldn't chop off the lower bits. > > > > > > It's just to control track position. Precision is critical but right now > > > latency isn't. > > > > > > thx, > > > > > > -- p > > > > > > ------------------------------------------------------------------------------ > > > This SF.net email is sponsored by Windows: > > > > > > Build for Windows Store. > > > > > > http://p.sf.net/sfu/windows-dev2dev > > > _______________________________________________ > > > Get Mixxx, the #1 Free MP3 DJ Mixing software Today > > > http://mixxx.org > > > > > > > > > Mixxx-devel mailing list > > > mixxx-devel-5nwgofrqmnerv+lv9mx5uipxlwaov...@public.gmane.org > > > https://lists.sourceforge.net/lists/listinfo/mixxx-devel > > > > > > > > > > > ------------------------------------------------------------------------------ > > This SF.net email is sponsored by Windows: > > > > Build for Windows Store. > > > > http://p.sf.net/sfu/windows-dev2dev > > _______________________________________________ > > Get Mixxx, the #1 Free MP3 DJ Mixing software Today > > http://mixxx.org > > > > > > Mixxx-devel mailing list > > mixxx-devel-5nwgofrqmnerv+lv9mx5uipxlwaov...@public.gmane.org > > https://lists.sourceforge.net/lists/listinfo/mixxx-devel > > > > > ------------------------------------------------------------------------------ > This SF.net email is sponsored by Windows: > > Build for Windows Store. > > http://p.sf.net/sfu/windows-dev2dev > _______________________________________________ > Get Mixxx, the #1 Free MP3 DJ Mixing software Today > http://mixxx.org > > > Mixxx-devel mailing list > Mixxx-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/mixxx-devel > ------------------------------------------------------------------------------ This SF.net email is sponsored by Windows: Build for Windows Store. http://p.sf.net/sfu/windows-dev2dev _______________________________________________ Get Mixxx, the #1 Free MP3 DJ Mixing software Today http://mixxx.org Mixxx-devel mailing list Mixxx-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/mixxx-devel
